<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link href="css/style.css" type="text/css" rel="stylesheet">
    <script src="js/script.js"></script>
</head>
<body>
<ul>
    <li>
        <a href="#">电脑办公</a>
        <div class="list">
            hello1
        </div>
    </li>
    <li>
        <a href="#">家用电器</a>
        <div class="list">
            hello2
        </div>
    </li>

    <li>
        <a href="#">手机电器</a>
        <div class="list">
            hello3
        </div>
    </li>
</ul>
</body>
</html>